| Donostia to Olympia Heights (Florida) | 4,458.61 mi (7,175.43 km) |
| Donostia to Omaha (Nebraska) | 4,530.23 mi (7,290.71 km) |
| Donostia to On Top of the World Designated Place (Florida) | 4,411.48 mi (7,099.59 km) |
| Donostia to Onalaska (Wisconsin) | 4,224.27 mi (6,798.31 km) |
| Donostia to Oneida (New York) | 3,581.68 mi (5,764.16 km) |
| Donostia to Oneonta (New York) | 3,574.69 mi (5,752.91 km) |
| Donostia to Ontario (California) | 5,729.06 mi (9,220.04 km) |
| Donostia to Ontario (Oregon) | 5,194.51 mi (8,359.76 km) |
| Donostia to Opa-locka (Florida) | 4,447.05 mi (7,156.83 km) |
| Donostia to Opelika (Alabama) | 4,411.78 mi (7,100.07 km) |
| Donostia to Opelousas (Louisiana) | 4,814.03 mi (7,747.43 km) |
| Donostia to Orange (California) | 5,749.44 mi (9,252.83 km) |
| Donostia to Orange (Texas) | 4,909.04 mi (7,900.34 km) |
| Donostia to Orange City (Florida) | 4,370.32 mi (7,033.35 km) |
| Donostia to Orangeburg (South Carolina) | 4,165.96 mi (6,704.46 km) |
